Optical imaging lens

ABSTRACT

An optical imaging lens may include a first, a second, a third, a fourth, a fifth and a sixth lens elements positioned in an order from an object side to an image side. The optical imaging lens may satisfy (G12+G56)/(G23+T3+G34)≥2.500, wherein an air gap between the first lens element and the second lens element along the optical axis is represented by G12, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, an air gap between the fifth lens element and the sixth lens element along the optical axis is represented by G56, and a thickness of the third lens element along the optical axis is represented by T3.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to P.R.C. Patent Application No.201811141204.1 titled “Optical Imaging Lens,” filed on Sep. 29, 2018,with the State Intellectual Property Office of the People's Republic ofChina (SIPO).

TECHNICAL FIELD

The present disclosure relates to an optical imaging lens, andparticularly, to an optical imaging lens having six lens elements.

BACKGROUND

In recent years, the popularity of electronic photographic devices hasmade the demand for the photographic device application more and morediverse. In addition to the requirement for good image quality, theexpansion of the field of view and the stability of the imaging qualityof the device at different temperatures are also receiving more and moreattention.

In addition, the conventional optical imaging lens with six lenselements has a large distance from the object-side surface of the firstlens to the image plane along the optical axis, which is disadvantageousfor the thinning of the photographic device. Therefore, in order tosatisfy the demand for the modern application of the optical imaginglens, producing an optical imaging lens with a short lens length, largefield of view angle, high thermal stability and good image quality isresearch and development focus.

SUMMARY

In light of the abovementioned problems, the optical imaging lens havinggood imaging quality, a shortened length, increased field of view andenhanced thermal stability is the point of improvement.

The present disclosure provides an optical imaging lens for capturingimages and videos such as the optical imaging lens of cell phones,cameras, tablets and personal digital assistants, building photographicdevice, and car lenses. By controlling the convex or concave shape ofthe surfaces of six lens elements, the size of the optical imaging lensmay be reduced and field of view of the optical imaging lens may beextended while maintaining good optical characteristics.

In the specification, parameters used herein may include:

Parameter Definition T1 A thickness of the first lens element along theoptical axis G12 A distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, i.e., an air gap between the first lens element andthe second lens element along the optical axis T2 A thickness of thesecond lens element along the optical axis G23 A distance from theimage-side surface of the second lens element to the object- sidesurface of the third lens element along the optical axis, i.e., an airgap between the second lens element and the third lens element along theoptical axis T3 A thickness of the third lens element along the opticalaxis G34 A distance from the image-side surface of the third lenselement to the object-side surface of the fourth lens element along theoptical axis, i.e., an air gap between the third lens element and thefourth lens element along the optical axis T4 A thickness of the fourthlens element along the optical axis G45 A distance from the image-sidesurface of the fourth lens element to the object- side surface of thefifth lens element along the optical axis, i.e., an air gap between thefourth lens element and the fifth lens element along the optical axis T5A thickness of the fifth lens element along the optical axis G56 Adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis,i.e., an air gap between the fifth lens element and the sixth lenselement along the optical axis T6 A thickness of the sixth lens elementalong the optical axis G6F A distance from the image-side surface of thesixth lens element to the object-side surface of the filtering unitalong the optical axis, i.e., an air gap between the sixth lens elementand the filtering unit along the optical axis TTF A thickness of thefiltering unit along the optical axis GFP A distance from the image-sidesurface of the filtering unit to the image plane along the optical axis,i.e., an air gap between the filtering unit and the image plane alongthe optical axis f1 A focal length of the first lens element f2 A focallength of the second lens element f3 A focal length of the third lenselement f4 A focal length of the fourth lens element f5 A focal lengthof the fifth lens element f6 A focal length of the sixth lens element n1A refractive index of the first lens element n2 A refractive index ofthe second lens element n3 A refractive index of the third lens elementn4 A refractive index of the fourth lens element n5 A refractive indexof the fifth lens element n6 A refractive index of the sixth lenselement V1 An Abbe number of the first lens element V2 An Abbe number ofthe second lens element V3 An Abbe number of the third lens element V4An Abbe number of the fourth lens element V5 An Abbe number of the fifthlens element V6 An Abbe number of the sixth lens element HFOV Half Fieldof View of the optical imaging lens Fno F-number of the optical imaginglens EFL An effective focal length of the optical imaging lens TTL Adistance from the object-side surface of the first lens element to theimage plane along the optical axis, i.e., the length of the opticalimaging lens ALT A sum of the thicknesses of six lens elements from thefirst lens element to the sixth lens element along the optical axis,i.e., a sum of the thicknesses of the first lens element, the secondlens element, the third lens element, the fourth lens element, the fifthlens element and the sixth lens element along the optical axis AAG A sumof the five air gaps from the first lens element to the sixth lenselement along the optical axis, i.e., a sum of the a distance from theimage-side surface of the first lens element to the object-side surfaceof the second lens element along the optical axis, a distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis, a distance from theimage-side surface of the fourth lens element to the object-side surfaceof the fifth lens element along the optical axis, and a distance fromthe image-side surface of the fifth lens element to the object-sidesurface of the sixth lens element along the optical axis BFL A backfocal length of the optical imaging lens, i.e., a distance from theimage- side surface of the sixth lens element to the image plane alongthe optical axis TL A distance from the object-side surface of the firstlens element to the image-side surface of the sixth lens element alongthe optical axis

According to an embodiment of the optical imaging lens of the presentdisclosure, an optical imaging lens may comprise a first lens element, asecond lens element, a third lens element, a fourth lens element, afifth lens element and a sixth lens element sequentially from an objectside to an image side along an optical axis. The first lens element tothe sixth lens element may each comprise an object-side surface facingtoward the object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through. The first lens element may have negativerefracting power. An optical axis region of the object-side surface ofthe second lens element may be concave. A periphery region of theobject-side surface of the fifth lens element may be convex. An opticalaxis region of the image-side surface of the sixth lens element may beconcave. A periphery region of the image-side surface of the sixth lenselement may be convex. The optical imaging lens may comprise no otherlenses having refracting power beyond the six lens elements. The opticalimaging lens may satisfy an Inequality:(G12+G56)/(G23+T3+G34)≥2.500  Inequality (1).

According to another embodiment of the optical imaging lens of thepresent disclosure, an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element sequentially froman object side to an image side along an optical axis. The first lenselement to the sixth lens element may each comprise an object-sidesurface facing toward the object side and allowing imaging rays to passthrough and an image-side surface facing toward the image side andallowing the imaging rays to pass through. The first lens element mayhave negative refracting power. An optical axis region of theobject-side surface of the second lens element may be concave. Anoptical axis region of the object-side surface of the fourth lenselement may be convex. A periphery region of the object-side surface ofthe fifth lens element may be convex. An optical axis region of theimage-side surface of the sixth lens element may be concave. A peripheryregion of the image-side surface of the sixth lens element may beconvex. The optical imaging lens may comprise no other lenses havingrefracting power beyond the six lens elements. The optical imaging lensmay satisfy an Inequality:(G12+G56)/(G23+T3+G34)≥2.000  Inequality (1′).

According to another embodiment of the optical imaging lens of thepresent disclosure, an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element sequentially froman object side to an image side along an optical axis. The first lenselement to the sixth lens element may each comprise an object-sidesurface facing toward the object side and allowing imaging rays to passthrough and an image-side surface facing toward the image side andallowing the imaging rays to pass through. An optical axis region of theobject-side surface of the second lens element may be concave. Anoptical axis region of the image-side surface of the third lens elementmay be convex. An optical axis region of the object-side surface of thefourth lens element may be convex. A periphery region of the image-sidesurface of the fourth lens element may be concave. A periphery region ofthe object-side surface of the fifth lens element may be convex. Anoptical axis region of the image-side surface of the sixth lens elementmay be concave. The optical imaging lens may comprise no other lenseshaving refracting power beyond the six lens elements. The opticalimaging lens may satisfy an Inequality:(G12+G56)/(G23+T3+G34)≥2.000  Inequality (1′).

In abovementioned three exemplary embodiments, some Inequalities couldbe selectively taken into consideration as follows:(V1+V5)N2≥4.400  Inequality (2);AAG/(G45+G56)≤2.900  Inequality (3);TL/(T2+T3+T4)≥3.300  Inequality (4);(T1+G12)/T6≥2.800  Inequality (5);(T2+T5)/T3≥5.000  Inequality (6);ALT/(T2+G23)≤4.400  Inequality (7);BFL/T1≤2.400  Inequality (8);TTL/(T5+G56+T6)≤3.500  Inequality (9);ALT/(G12+G45)≤4.600  Inequality (10);(T1+T2)/T3≥3.400  Inequality (11);(T1+T6)/T4≥3.400  Inequality (12);BFL/(G23+G34+G45)≤3.100  Inequality (13);(T4+T5)/G12≥2.200  Inequality (14);(G56+T6)/T1≤3.100  Inequality (15);EFL/(T3+T4)≥2.700  Inequality (16);T5/T2≥1.000  Inequality(17); andAAG/(T3+T6)≥2.500  Inequality (18)

In some example embodiments, more details about the convex or concavesurface structure, refracting power or chosen material etc. could beincorporated for one specific lens element or broadly for a plurality oflens elements to improve the control for the system performance and/orresolution. It is noted that the details listed herein could beincorporated into the example embodiments if no inconsistency occurs.

Through controlling the convex or concave shape of the surfaces and atleast one inequality, the optical imaging lens in the exampleembodiments may achieve good imaging quality, the length of the opticalimaging lens may be effectively shortened, and field of view of theoptical imaging lens may be extended.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appendeddrawings, in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to one embodiment of the present disclosure;

FIG. 2 depicts a schematic view of a relation between a surface shapeand an optical focus of a lens element;

FIG. 3 depicts a schematic view of a first example of a surface shapeand an effective radius of a lens element;

FIG. 4 depicts a schematic view of a second example of a surface shapeand an effective radius of a lens element;

FIG. 5 depicts a schematic view of a third example of a surface shapeand an effective radius of a lens element;

FIG. 6 depicts a cross-sectional view of the optical imaging lensaccording to the first embodiment of the present disclosure;

FIG. 7 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe first embodiment of the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of anoptical imaging lens according to the first embodiment of the presentdisclosure;

FIG. 9 depicts a table of aspherical data of the optical imaging lensaccording to the first embodiment of the present disclosure;

FIG. 10 depicts a cross-sectional view of the optical imaging lensaccording to the second embodiment of the present disclosure;

FIG. 11 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe second embodiment of the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of theoptical imaging lens according to the second embodiment of the presentdisclosure;

FIG. 13 depicts a table of aspherical data of the optical imaging lensaccording to the second embodiment of the present disclosure;

FIG. 14 depicts a cross-sectional view of the optical imaging lensaccording to the third embodiment of the present disclosure;

FIG. 15 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations the optical imaging lens according to thethird embodiment of the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens according to the third embodiment of the presentdisclosure;

FIG. 17 depicts a table of aspherical data of the optical imaging lensaccording to the third embodiment of the present disclosure;

FIG. 18 depicts a cross-sectional view of the optical imaging lensaccording to the fourth embodiment of the present disclosure;

FIG. 19 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe fourth embodiment of the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of theoptical imaging lens according to the fourth embodiment of the presentdisclosure;

FIG. 21 depicts a table of aspherical data of the optical imaging lensaccording to the fourth embodiment of the present disclosure;

FIG. 22 depicts a cross-sectional view of the optical imaging lensaccording to the fifth embodiment of the present disclosure;

FIG. 23 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe fifth embodiment of the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens according to the fifth embodiment of the presentdisclosure;

FIG. 25 depicts a table of aspherical data of the optical imaging lensaccording to the fifth embodiment of the present disclosure;

FIG. 26 depicts a cross-sectional view of the optical imaging lensaccording to the sixth embodiment of the present disclosure;

FIG. 27 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe sixth embodiment of the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of theoptical imaging lens according to the sixth embodiment of the presentdisclosure;

FIG. 29 depicts a table of aspherical data of the optical imaging lensaccording to the sixth embodiment of the present disclosure;

FIG. 30 depicts a cross-sectional view of the optical imaging lensaccording to the seventh embodiment of the present disclosure;

FIG. 31 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe seventh embodiment of the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of theoptical imaging lens according to the seventh embodiment of the presentdisclosure;

FIG. 33 depicts a table of aspherical data of the optical imaging lensaccording to the seventh embodiment of the present disclosure;

FIG. 34 depicts a cross-sectional view of the optical imaging lensaccording to the eighth embodiment of the present disclosure;

FIG. 35 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe eighth embodiment of the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of theoptical imaging lens according to the eighth embodiment of the presentdisclosure;

FIG. 37 depicts a table of aspherical data of the optical imaging lensaccording to the eighth embodiment of the present disclosure;

FIG. 38 depicts a cross-sectional view of the optical imaging lensaccording to the ninth embodiment of the present disclosure;

FIG. 39 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe ninth embodiment of the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of theoptical imaging lens according to the ninth embodiment of the presentdisclosure;

FIG. 41 depicts a table of aspherical data of the optical imaging lensaccording to the ninth embodiment of the present disclosure;

FIG. 42 depicts a cross-sectional view of the optical imaging lensaccording to the tenth embodiment of the present disclosure;

FIG. 43 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe tenth embodiment of the present disclosure;

FIG. 44 depicts a table of optical data for each lens element of theoptical imaging lens according to the tenth embodiment of the presentdisclosure;

FIG. 45 depicts a table of aspherical data of the optical imaging lensaccording to the tenth embodiment of the present disclosure;

FIG. 46 depicts a cross-sectional view of the optical imaging lensaccording to the eleventh embodiment of the present disclosure;

FIG. 47 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe eleventh embodiment of the present disclosure;

FIG. 48 depicts a table of optical data for each lens element of theoptical imaging lens according to the eleventh embodiment of the presentdisclosure;

FIG. 49 depicts a table of aspherical data of the optical imaging lensaccording to the eleventh embodiment of the present disclosure;

FIG. 50 depicts a cross-sectional view of the optical imaging lensaccording to the twelfth embodiment of the present disclosure;

FIG. 51 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe twelfth embodiment of the present disclosure;

FIG. 52 depicts a table of optical data for each lens element of theoptical imaging lens according to the twelfth embodiment of the presentdisclosure;

FIG. 53 depicts a table of aspherical data of the optical imaging lensaccording to the twelfth embodiment of the present disclosure;

FIG. 54 depicts a cross-sectional view of the optical imaging lensaccording to the thirteenth embodiment of the present disclosure;

FIG. 55 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe thirteenth embodiment of the present disclosure;

FIG. 56 depicts a table of optical data for each lens element of theoptical imaging lens according to the thirteenth embodiment of thepresent disclosure;

FIG. 57 depicts a table of aspherical data of the optical imaging lensaccording to the thirteenth embodiment of the present disclosure;

FIG. 58 depicts a cross-sectional view of the optical imaging lensaccording to the fourteenth embodiment of the present disclosure;

FIG. 59 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the optical imaging lens according tothe fourteenth embodiment of the present disclosure;

FIG. 60 depicts a table of optical data for each lens element of theoptical imaging lens according to the fourteenth embodiment of thepresent disclosure;

FIG. 61 depicts a table of aspherical data of the optical imaging lensaccording to the fourteenth embodiment of the present disclosure;

FIGS. 62A and 62B are tables for the values of T1, G12, T2, G23, T3,G34, T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)/V2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) as determined in thefirst to fourteenth embodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentdisclosure. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the disclosure. In this respect, as used herein, theterm “in” may include “in” and “on”, and the terms “a”, “an” and “the”may include singular and plural references. Furthermore, as used herein,the term “by” may also mean “from”, depending on the context.Furthermore, as used herein, the term “if” may also mean “when” or“upon”, depending on the context. Furthermore, as used herein, the words“and/or” may refer to and encompass any and all possible combinations ofone or more of the associated listed items.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1, a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1, the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2, optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2. Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2. Accordingly, since theextension line EL of the ray intersects the optical axis I on the objectside A1 of the lens element 200, periphery region Z2 is concave. In thelens element 200 illustrated in FIG. 2, the first transition point TP1is the border of the optical axis region and the periphery region, i.e.,TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Zemax and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex- (concave-) region,” can be usedalternatively.

FIG. 3, FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3, only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3, since the shape of the optical axis regionZ1 is concave, the shape of the periphery region Z2 will be convex asthe shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4, a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4, theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5, the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

According to an embodiment of the optical imaging lens of the presentdisclosure, an optical imaging lens may comprise a first lens element, asecond lens element, a third lens element, a fourth lens element, afifth lens element and a sixth lens element sequentially from an objectside to an image side along an optical axis. The first lens element tothe sixth lens element may each comprise an object-side surface facingtoward the object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through. By designing the following detail features of sixlens elements incorporated one another, the length of the opticalimaging lens may be effectively shortened and field of view of theoptical imaging lens may be effectively extended while maintaining goodoptical characteristics.

According to some embodiments of the present invention, to optimize theimaging quality of the optical imaging lens, the field curvature and thedistortion can be reduced and the field of view can be extendedeffectively by the concave and convex design of the surface of the lenselements and the definition of the refractive power as follows: thefirst lens element may have negative refracting power, an optical axisregion of the object-side surface of the second lens element may beconcave, an optical axis region of the image-side surface of the thirdlens element may be convex, an optical axis region of the object-sidesurface of the fourth lens element may be convex, a periphery region ofthe image-side surface of the fourth element may be concave, a peripheryregion of the object-side surface of the fifth lens element may beconvex, an optical axis region of the image-side surface of the sixthlens element may be concave, and a periphery region of the image-sidesurface of the sixth lens element may be convex.

Moreover, the optical imaging lens satisfying an Inequality (1′),(G12+G56)/(G23+T3+G34) 2.000, may be beneficial for extending the fieldof view of the optical imaging lens. The further restrictions forInequality (1′) that may constitute better configuration are as follows:2.000≤(G12+G56)/(G23+T3+G34)≤3.800. Further, the optical imaging lenssatisfying an Inequality (1), (G12+G56)/(G23+T3+G34) 2.500, may havehigh manufacturing yield, and the further restrictions for Inequality(1) that may constitute better configuration are as follows:2.500≤(G12+G56)/(G23+T3+G34)≤3.800.

In some embodiments of the optical imaging lens of the presentdisclosure, the optical imaging lens may optionally satisfy anInequality (2), (V1+V5)/V2≥4.400, may be beneficial for increasing thethermal stability of the optical imaging lens under differenttemperatures, such that the image quality may not be influenced by thetemperature change. The further restrictions for Inequality (2) that mayconstitute better configuration are as follows: 4.400≤(V1+V5)/V2≤5.500,in which the thermal stability of the optical imaging lens may be betterwhen the material of the first lens element and the fifth element isglass.

In some embodiments of the optical imaging lens of the presentdisclosure, in addition to Inequality (1), the optical imaging lens maysatisfy at least one of Inequalities (3)-(18) for decreasing the lengthof the optical imaging lens and improving the imaging quality thereof byadjusting air gaps between the lens elements or thicknesses of the lenselements along the optical axis. Since the difficulty of manufacture mayalso be considered, the further restrictions for Inequalities (3)-(18)defined below may constitute better configuration:1.500≤AAG/(G45+G56)≤2.900;3.300≤TL/(T2+T3+T4)≤5.200;2.800≤(T1+G12)/T6≤7.500;5.000≤(T2+T5)/T3≤7.300;2.600≤ALT/(T2+G23)≤4.400;0.400≤BFL/T1≤2.400;2.300≤TTL/(T5+G56+T6)≤3.500;1.800≤ALT/(G12+G45)≤4.600;3.400≤(T1+T2)/T3≤6.400;3.400≤(T1+T6)/T4≤8.000;1.100≤BFL/(G23+G34+G45)≤3.100;0.700≤(T4+T5)/G12≤2.200;0.700≤(G56+T6)/T1≤3.100;2.700≤EFL/(T3+T4)≤4.100;1.000≤T5/T2≤2.200; and2.500≤AAG/(T3+T6)≤4.200.

In addition, any combination of the parameters of the embodiment may beselected to increase the optical imaging lens limitation to facilitatethe optical imaging lens design of the same architecture of the presentinvention. In consideration of the non-predictability of design for theoptical system, while the optical imaging lens may satisfy any one ofinequalities described above, the optical imaging lens according to thedisclosure herein may achieve a shortened length and an extended fieldof view, provide an increased aperture and an increased thermalstability, improve an imaging quality and/or assembly yield, and/oreffectively improve drawbacks of a typical optical imaging lens.

Several exemplary embodiments and associated optical data will now beprovided to illustrate non-limiting examples of optical imaging lenssystems having good optical characteristics, an increased thermalstability and an extended field of view. Reference is now made to FIGS.6-9. FIG. 6 illustrates an example cross-sectional view of an opticalimaging lens 1 having six lens elements according to a first exampleembodiment. FIG. 7 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 1 according to the first example embodiment. FIG. 8 illustrates anexample table of optical data of each lens element of the opticalimaging lens 1 according to the first example embodiment. FIG. 9 depictsan example table of aspherical data of the optical imaging lens 1according to the first example embodiment.

As shown in FIG. 6, the optical imaging lens 1 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6. Afiltering unit TF and an image plane IMA of an image sensor (not shown)may be positioned at the image side A2 of the optical imaging lens 1.Each of the first, second, third, fourth, fifth and sixth lens elementsL1, L2, L3, L4, L5 and L6, and the filtering unit TF may comprise anobject-side surface L1A1/L2A1/L3A1/L4A1/L5A1/L6A1/TFA1 facing toward theobject side A1 and an image-side surfaceL1A2/L2A2/L3A2/L4A2/L5A2/L6A2/TFA2 facing toward the image side A2. Theexample embodiment of the illustrated filtering unit TF may bepositioned between the sixth lens element L6 and the image plane IMA.The filtering unit TF may be an infrared cut-off filter for preventingunwanted IR light from reaching the mage plane IMA and affecting imagingquality.

Exemplary embodiments of each lens element of the optical imaging lens 1will now be described with reference to the drawings. The lens elementsL2, L3, L4 and L6 of the optical imaging lens 1 may be constructed usingplastic materials in this embodiment. For increasing the thermalstability of the optical imaging lens 1, the lens elements L1 and L5 maybe constructed using glass materials in this embodiment.

An example embodiment of the first lens element L1 may have negativerefracting power. Both of the optical axis region L1A1C and theperiphery region L1A1P of the object-side surface L1A1 of the first lenselement L1 may be convex. Both of the optical axis region L1A2C and theperiphery region L1A2P of the image-side surface L1A2 of the first lenselement L1 may be concave. Both of the object-side surface L1A1 and theimage-side surface L1A2 of the first lens element L1 may be sphericalsurfaces.

An example embodiment of the second lens element L2 may have positiverefracting power. Both of the optical axis region L2A1C and theperiphery region L2A1P of the object-side surface L2A1 of the secondlens element L2 may be concave. Both of the optical axis region L2A2Cand the periphery region L2A2P of the image-side surface L2A2 of thesecond lens element L2 may be convex. Both of the object-side surfaceL2A1 and the image-side surface L2A2 of the second lens element L2 maybe aspherical surfaces.

An example embodiment of the third lens element L3 may have positiverefracting power. Both of the optical axis region L3A1C and theperiphery region L3A1P of the object-side surface L3A1 of the third lenselement L3 may be convex. Both of the optical axis region L3A2C and theperiphery region L3A2P of the image-side surface L3A2 of the third lenselement L3 may be convex. Both of the object-side surface L3A1 and theimage-side surface L3A2 of the third lens element L3 may be asphericalsurfaces.

An example embodiment of the fourth lens element L4 may have negativerefracting power. The optical axis region L4A1C of the object-sidesurface L4A1 of the fourth lens element L4 may be convex. The peripheryregion L4A1P of the object-side surface L4A1 of the fourth lens elementL4 may be concave. Both of the optical axis region L4A2C and theperiphery region L4A2P of the image-side surface L4A2 of the fourth lenselement L4 may be concave. Both of the object-side surface L4A1 and theimage-side surface L4A2 of the fourth lens element L4 may be asphericalsurfaces.

An example of the fifth lens element L5 may have positive refractingpower. Both of the optical axis region L5A1C and the periphery regionL5A1P of the object-side surface L5A1 of the fifth lens element L5 maybe convex. Both of the optical axis region L5A2C and the peripheryregion L5A2P of the image-side surface L5A2 of the fifth lens element L5may be convex. Both of the object-side surface L5A1 and the image-sidesurface L5A2 of the fifth lens element L5 may be spherical surfaces.

An example of the sixth lens element L6 may have negative refractingpower. The optical axis region L6A1C of the object-side surface L6A1 ofthe sixth lens element L6 may be convex. The periphery region L6A1P ofthe object-side surface L6A1 of the sixth lens element L6 may beconcave. The optical axis region L6A2C of the image-side surface L6A2 ofthe sixth lent element L6 may be concave. The periphery region L6A2P ofthe image-side surface L6A2 of the sixth lens element L6 may be convex.Both of the object-side surface L6A1 and the image-side surface L6A2 ofthe sixth lens element L6 may be aspherical surfaces.

The aspherical surfaces including the object-side surface L2A1 and theimage-side surface L2A2 of the second lens element L2, the object-sidesurface L3A1 and the image-side surface L3A2 of the third lens elementL3, the object-side surface L4A1 and the image-side surface L4A2 of thefourth lens element L4, and the object-side surface L6A1 and theimage-side surface L6A2 of the sixth lens element L6 may all be definedby the following aspherical formula (1):

$\begin{matrix}{{Z(Y)} = {{\frac{Y^{2}}{R}\text{/}\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}} & {{formula}\mspace{14mu}(1)}\end{matrix}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant; and

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 9.

FIG. 7(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm and 650 nm), wherein thehorizontal axis of FIG. 7(a) defines the focus position, and wherein thevertical axis of FIG. 7(a) defines the field of view. FIG. 7(b) showsthe field curvature aberration in the sagittal direction for threerepresentative wavelengths (470 nm, 555 nm and 650 nm), wherein thehorizontal axis of FIG. 7(b) defines the focus position, and wherein thevertical axis of FIG. 7(b) defines the image height. FIG. 7(c) shows thefield curvature aberration in the tangential direction for threerepresentative wavelengths (470 nm, 555 nm and 650 nm), wherein thehorizontal axis of FIG. 7(c) defines the focus position, and wherein thevertical axis of FIG. 7(c) defines the image height. FIG. 7(d) shows avariation of the distortion aberration, wherein the horizontal axis ofFIG. 7(d) defines the percentage, and wherein the vertical axis of FIG.7(d) defines the image height. The three curves with differentwavelengths (470 nm, 555 nm and 650 nm) may represent that off-axislight with respect to these wavelengths may be focused around an imagepoint. From the vertical deviation of each curve shown in FIG. 7(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.03 mm Therefore, the first embodiment may improve thelongitudinal spherical aberration with respect to different wavelengths.Referring to FIG. 7(b), the focus variation with respect to the threedifferent wavelengths (470 nm, 555 nm and 650 nm) in the whole field mayfall within about ±0.03 mm. Referring to FIG. 7(c), the focus variationwith respect to the three different wavelengths (470 nm, 555 nm and 650nm) in the whole field may fall within about ±0.03 mm Referring to FIG.7(d), and more specifically the horizontal axis of FIG. 7(d), thevariation of the distortion aberration may be within about ±60%.

The distance from the object-side surface L1A1 of the first lens elementL1 to the image plane IMA along the optical axis (TTL) may be about10.850 mm, Fno may be about 2.4, HFOV may be about 65.602 degrees, andthe effective focal length (EFL) of the optical imaging lens 1 may beabout 3.599 mm. In accordance with these values, the present embodimentmay provide an optical imaging lens having a shortened length and anextended field of view while improving optical performance.

Please refer to FIG. 62A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62A, (V1+V5)N2 in this embodiment may be designed to beequal to 5.399, such that the optical imaging lens 1 in this embodimenthas better thermal stability. More specifically, the normal temperatureof 20° C. is set as a reference at which the focal shift of the opticalimaging lens 1 is 0 mm. When the temperature is lowered to 0° C., thefocal shift of the optical imaging lens 1 is −0.0037 mm. When thetemperature rises to 60° C., the focal shift of the optical imaging lens1 is 0.0003 mm.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 having six lenselements according to a second example embodiment. FIG. 11 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 2 according to the secondexample embodiment. FIG. 12 shows an example table of optical data ofeach lens element of the optical imaging lens 2 according to the secondexample embodiment. FIG. 13 shows an example table of aspherical data ofthe optical imaging lens 2 according to the second example embodiment.

As shown in FIG. 10, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 2 mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 12 for the opticalcharacteristics of each lens element in the optical imaging lens 2 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 11(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.025 mm Referring to FIG. 11(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm and 650 nm)in the whole field may fall within about ±0.03 mm Referring to FIG.11(c), the focus variation with respect to the three differentwavelengths (470 nm, 555 nm and 650 nm) in the whole field may fallwithin about ±0.03 mm Referring to FIG. 11(d), the variation of thedistortion aberration of the optical imaging lens 2 may be within about±100%.

In comparison with the first embodiment, the longitudinal sphericalaberration in the second embodiment may be smaller, the effective focallength of the optical imaging lens 2 may be shorter, and the field ofview of the optical imaging lens 2 may be larger as shown in FIG. 11 andFIG. 12. Moreover, the optical imaging lens 2 may be easier to bemanufactured, such that yield thereof may be higher.

Please refer to FIG. 62A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62A, (V1+V5)N2 in this embodiment may be designed to beequal to 5.399, such that the optical imaging lens 2 in this embodimenthas better thermal stability. More specifically, the normal temperatureof 20° C. is set as a reference at which the focal shift of the opticalimaging lens 2 is 0 mm. When the temperature is lowered to 0° C., thefocal shift of the optical imaging lens 2 is −0.0064 mm. When thetemperature rises to 60° C., the focal shift of the optical imaging lens2 is 0.0058 mm.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 having six lenselements according to a third example embodiment. FIG. 15 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 3 according to the third exampleembodiment. FIG. 16 shows an example table of optical data of each lenselement of the optical imaging lens 3 according to the third exampleembodiment. FIG. 17 shows an example table of aspherical data of theoptical imaging lens 3 according to the third example embodiment.

As shown in FIG. 14, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 3 mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 16 for the opticalcharacteristics of each lens element in the optical imaging lens 3 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 15(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.02 mm Referring to FIG. 15(b), the focus variation with respectto the three different wavelengths (470 nm, 555 nm and 650 nm) in thewhole field may fall within about ±0.02 mm Referring to FIG. 15(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm and 650 nm) in the whole field may fall within about ±0.03 mmReferring to FIG. 15(d), the variation of the distortion aberration ofthe optical imaging lens 3 may be within about ±50%.

In comparison with the first embodiment, the effective focal length ofthe optical imaging lens 3 may be shorter, and the longitudinalspherical aberration, the field curvature aberration in the sagittaldirection and the distortion aberration in the third embodiment may besmaller as shown in FIG. 15 and FIG. 16. Moreover, the optical imaginglens 3 may be easier to be manufactured, such that yield thereof may behigher.

Please refer to FIG. 62A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62A, (V1+V5)N2 in this embodiment may be designed to beequal to 5.399, such that the optical imaging lens 3 in this embodimenthas better thermal stability. More specifically, the normal temperatureof 20° C. is set as a reference at which the focal shift of the opticalimaging lens 3 is 0 mm. When the temperature is lowered to 0° C., thefocal shift of the optical imaging lens 3 is −0.0044 mm. When thetemperature rises to 60° C., the focal shift of the optical imaging lens3 is 0.0011 mm.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 having six lenselements according to a fourth example embodiment. FIG. 19 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 4 according to the fourthexample embodiment. FIG. 20 shows an example table of optical data ofeach lens element of the optical imaging lens 4 according to the fourthexample embodiment. FIG. 21 shows an example table of aspherical data ofthe optical imaging lens 4 according to the fourth example embodiment.

As shown in FIG. 18, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 4 mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 20 for the opticalcharacteristics of each lens element in the optical imaging lens 4 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 19(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.03 mm Referring to FIG. 19(b), the focus variation with respectto the three different wavelengths (470 nm, 555 nm and 650 nm) in thewhole field may fall within about ±0.03 mm Referring to FIG. 19(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm and 650 nm) in the whole field may fall within about ±0.04 mmReferring to FIG. 19(d), the variation of the distortion aberration ofthe optical imaging lens 4 may be within about ±60%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 4 may be shorter and the field of view of theoptical image lens 4 may be larger as shown in FIG. 19 and FIG. 20.Moreover, the optical imaging lens 4 may be easier to be manufactured,such that yield thereof may be higher.

Please refer to FIG. 62A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62A, (V1+V5)N2 in this embodiment may be designed to beequal to 5.399, such that the optical imaging lens 4 in this embodimenthas better thermal stability. More specifically, the normal temperatureof 20° C. is set as a reference at which the focal shift of the opticalimaging lens 4 is 0 mm. When the temperature is lowered to 0° C., thefocal shift of the optical imaging lens 1 is −0.0038 mm. When thetemperature rises to 60° C., the focal shift of the optical imaging lens1 is 0.0003 mm.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 having six lenselements according to a fifth example embodiment. FIG. 23 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 5 according to the fifth exampleembodiment. FIG. 24 shows an example table of optical data of each lenselement of the optical imaging lens 5 according to the fifth exampleembodiment. FIG. 25 shows an example table of aspherical data of theoptical imaging lens 5 according to the fifth example embodiment.

As shown in FIG. 22, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 5 mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 24 for the opticalcharacteristics of each lens element in the optical imaging lens 5 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 23(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.02 mm Referring to FIG. 23(b), the focus variation with respectto the three different wavelengths (470 nm, 555 nm and 650 nm) in thewhole field may fall within about ±0.02 mm Referring to FIG. 23(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm and 650 nm) in the whole field may fall within about ±0.03 mmReferring to FIG. 23(d), the variation of the distortion aberration ofthe optical imaging lens 5 may be within about ±60%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 5 may be shorter, the field of view of theoptical image lens 5 may be larger, and the longitudinal sphericalaberration and the field curvature aberration in the sagittal directionin the fifth embodiment may be smaller as shown in FIG. 23 and FIG. 24.Moreover, the optical imaging lens 5 may be easier to be manufactured,such that yield thereof may be higher.

Please refer to FIG. 62A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62A, (V1+V5)N2 in this embodiment may be designed to beequal to 5.399, such that the optical imaging lens 5 in this embodimenthas better thermal stability. More specifically, the normal temperatureof 20° C. is set as a reference at which the focal shift of the opticalimaging lens 5 is 0 mm. When the temperature is lowered to 0° C., thefocal shift of the optical imaging lens 5 is −0.0038 mm. When thetemperature rises to 60° C., the focal shift of the optical imaging lens5 is 0.0005 mm.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having six lenselements according to a sixth example embodiment. FIG. 27 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 6 according to the sixth exampleembodiment. FIG. 28 shows an example table of optical data of each lenselement of the optical imaging lens 6 according to the sixth exampleembodiment. FIG. 29 shows an example table of aspherical data of theoptical imaging lens 6 according to the sixth example embodiment.

As shown in FIG. 26, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 6 mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 28 for the opticalcharacteristics of each lens element in the optical imaging lens 6 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 27(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.018 mm Referring to FIG. 27(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm and 650 nm)in the whole field may fall within about ±0.02 mm Referring to FIG.27(c), the focus variation with respect to the three differentwavelengths (470 nm, 555 nm and 650 nm) in the whole field may fallwithin about ±0.03 mm Referring to FIG. 27(d), the variation of thedistortion aberration of the optical imaging lens 6 may be within about±50%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 6 may be shorter, and the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction andthe distortion aberration in the sixth embodiment may be smaller asshown in FIG. 27 and FIG. 28. Moreover, the optical imaging lens 6 maybe easier to be manufactured, such that yield thereof may be higher.

Please refer to FIG. 62A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62A, (V1+V5)N2 in this embodiment may be designed to beequal to 5.222, such that the optical imaging lens 6 in this embodimenthas better thermal stability. More specifically, the normal temperatureof 20° C. is set as a reference at which the focal shift of the opticalimaging lens 6 is 0 mm. When the temperature is lowered to 0° C., thefocal shift of the optical imaging lens 6 is 0.0021 mm. When thetemperature rises to 60° C., the focal shift of the optical imaging lens6 is −0.0113 mm.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having six lenselements according to a seventh example embodiment. FIG. 31 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 7 according to theseventh example embodiment. FIG. 32 shows an example table of opticaldata of each lens element of the optical imaging lens 7 according to theseventh example embodiment. FIG. 33 shows an example table of asphericaldata of the optical imaging lens 7 according to the seventh exampleembodiment.

As shown in FIG. 30, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 7 mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 32 for the opticalcharacteristics of each lens element in the optical imaging lens 7 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 31(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.018 mm Referring to FIG. 31(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm and 650 nm)in the whole field may fall within about ±0.02 mm Referring to FIG.31(c), the focus variation with respect to the three differentwavelengths (470 nm, 555 nm and 650 nm) in the whole field may fallwithin about ±0.03 mm Referring to FIG. 31(d), the variation of thedistortion aberration of the optical imaging lens 7 may be within about±40%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 7 may be shorter, and the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction andthe distortion aberration in the sixth embodiment may be smaller asshown in FIG. 31 and FIG. 32. Moreover, the optical imaging lens 7 maybe easier to be manufactured, such that yield thereof may be higher.

Please refer to FIG. 62A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62A, (V1+V5)N2 in this embodiment may be designed to beequal to 5.155, such that the optical imaging lens 7 in this embodimenthas better thermal stability. More specifically, the normal temperatureof 20° C. is set as a reference at which the focal shift of the opticalimaging lens 7 is 0 mm. When the temperature is lowered to 0° C., thefocal shift of the optical imaging lens 7 is −0.0248 mm. When thetemperature rises to 60° C., the focal shift of the optical imaging lens7 is 0.0425 mm.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having six lenselements according to an eighth example embodiment. FIG. 35 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 8 according to theeighth example embodiment. FIG. 36 shows an example table of opticaldata of each lens element of the optical imaging lens 8 according to theeighth example embodiment. FIG. 37 shows an example table of asphericaldata of the optical imaging lens 8 according to the eighth exampleembodiment.

As shown in FIG. 34, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 8 mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 36 for the opticalcharacteristics of each lens element in the optical imaging lens 8 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 35(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.05 mm Referring to FIG. 35(b), the focus variation with respectto the three different wavelengths (470 nm, 555 nm and 650 nm) in thewhole field may fall within about ±0.05 mm Referring to FIG. 35(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm and 650 nm) in the whole field may fall within about ±0.05 mmReferring to FIG. 35(d), the variation of the distortion aberration ofthe optical imaging lens 8 may be within about ±60%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 8 may be shorter and the field of view of theoptical image lens 8 may be larger as shown in FIG. 35 and FIG. 36.

Please refer to FIG. 62B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62B, (V1+V5)/V2 in this embodiment may be designed tobe equal to 5.399, such that the optical imaging lens 8 in thisembodiment has better thermal stability. More specifically, the normaltemperature of 20° C. is set as a reference at which the focal shift ofthe optical imaging lens 8 is 0 mm. When the temperature is lowered to0° C., the focal shift of the optical imaging lens 8 is −0.0070 mm. Whenthe temperature rises to 60° C., the focal shift of the optical imaginglens 8 is 0.0068 mm.

Reference is now made to FIGS. 38-41. FIG. 38 illustrates an examplecross-sectional view of an optical imaging lens 9 having six lenselements according to a ninth example embodiment. FIG. 39 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 9 according to the ninth exampleembodiment. FIG. 40 shows an example table of optical data of each lenselement of the optical imaging lens 9 according to the ninth exampleembodiment. FIG. 41 shows an example table of aspherical data of theoptical imaging lens 9 according to the ninth example embodiment.

As shown in FIG. 38, the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 9 mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 40 for the opticalcharacteristics of each lens element in the optical imaging lens 9 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 39(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.016 mm Referring to FIG. 39(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm and 650 nm)in the whole field may fall within about ±0.02 mm Referring to FIG.39(c), the focus variation with respect to the three differentwavelengths (470 nm, 555 nm and 650 nm) in the whole field may fallwithin about ±0.03 mm Referring to FIG. 39(d), the variation of thedistortion aberration of the optical imaging lens 9 may be within about±80%.

In comparison with the first embodiment, the effective focal length andthe length of the optical imaging lens 9 may be shorter, the field ofview of the optical imaging lens 9 may be larger, and the longitudinalspherical aberration and the field curvature aberration in the sagittaldirection in the ninth embodiment may be smaller as shown in FIG. 39 andFIG. 40. Moreover, the optical imaging lens 9 may be easier to bemanufactured, such that yield thereof may be higher.

Please refer to FIG. 62B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62B, (V1+V5)/V2 in this embodiment may be designed tobe equal to 5.399, such that the optical imaging lens 9 in thisembodiment has better thermal stability. More specifically, the normaltemperature of 20° C. is set as a reference at which the focal shift ofthe optical imaging lens 9 is 0 mm. When the temperature is lowered to0° C., the focal shift of the optical imaging lens 9 is −0.0022 mm. Whenthe temperature rises to 60° C., the focal shift of the optical imaginglens 9 is −0.0012 mm.

Reference is now made to FIGS. 42-45. FIG. 42 illustrates an examplecross-sectional view of an optical imaging lens 10 having six lenselements according to a tenth example embodiment. FIG. 43 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 10 according to the tenthexample embodiment. FIG. 44 shows an example table of optical data ofeach lens element of the optical imaging lens 10 according to the tenthexample embodiment. FIG. 45 shows an example table of aspherical data ofthe optical imaging lens 10 according to the tenth example embodiment.

As shown in FIG. 42, the optical imaging lens 10 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 10 mayinclude a radius of curvature, a thickness, aspherical data and/or aneffective focal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 44 for the opticalcharacteristics of each lens element in the optical imaging lens 10 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 43(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.016 mm Referring to FIG. 43(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm and 650 nm)in the whole field may fall within about ±0.02 mm Referring to FIG.43(c), the focus variation with respect to the three differentwavelengths (470 nm, 555 nm and 650 nm) in the whole field may fallwithin about ±0.04 mm Referring to FIG. 43(d), the variation of thedistortion aberration of the optical imaging lens 10 may be within about±60%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 10 may be shorter, the field of view of theoptical imaging lens 10 may be larger, and the longitudinal sphericalaberration and the field curvature aberration in the sagittal directionin the tenth embodiment may be smaller as shown in FIG. 43 and FIG. 44.

Please refer to FIG. 62B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62B, (V1+V5)/V2 in this embodiment may be designed tobe equal to 5.399, such that the optical imaging lens 10 in thisembodiment has better thermal stability. More specifically, the normaltemperature of 20° C. is set as a reference at which the focal shift ofthe optical imaging lens 10 is 0 mm. When the temperature is lowered to0° C., the focal shift of the optical imaging lens 10 is −0.0067 mm.When the temperature rises to 60° C., the focal shift of the opticalimaging lens 10 is 0.0051 mm.

Reference is now made to FIGS. 46-49. FIG. 46 illustrates an examplecross-sectional view of an optical imaging lens 11 having six lenselements according to an eleventh example embodiment. FIG. 47 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 11 according to theeleventh example embodiment. FIG. 48 shows an example table of opticaldata of each lens element of the optical imaging lens 11 according tothe eleventh example embodiment. FIG. 49 shows an example table ofaspherical data of the optical imaging lens 11 according to the eleventhexample embodiment.

As shown in FIG. 46, the optical imaging lens 11 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, and L5A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 11 mayinclude the concave or concave surface structures of the object-sidesurface L6A1, a radius of curvature, a thickness, aspherical data and/oran effective focal length of each lens element. More specifically, theoptical axis region L6A1C of the object-side surface L6A1 of the sixthlens element L6 of the optical imaging lens 11 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 48 for the opticalcharacteristics of each lens element in the optical imaging lens 11 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 47(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.04 mm Referring to FIG. 47(b), the focus variation with respectto the three different wavelengths (470 nm, 555 nm and 650 nm) in thewhole field may fall within about ±0.02 mm Referring to FIG. 47(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm and 650 nm) in the whole field may fall within about ±0.04 mmReferring to FIG. 43(d), the variation of the distortion aberration ofthe optical imaging lens 11 may be within about ±60%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 11 may be shorter, the field of view of theoptical imaging lens 11 may be larger, and the field curvatureaberration in the sagittal direction in the eleventh embodiment may besmaller as shown in FIG. 47 and FIG. 48. Moreover, the optical imaginglens 11 may be easier to be manufactured, such that yield thereof may behigher.

Please refer to FIG. 62B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62B, (V1+V5)/V2 in this embodiment may be designed tobe equal to 5.399, such that the optical imaging lens 11 in thisembodiment has better thermal stability. More specifically, the normaltemperature of 20° C. is set as a reference at which the focal shift ofthe optical imaging lens 11 is 0 mm. When the temperature is lowered to0° C., the focal shift of the optical imaging lens 11 is −0.0081 mm.When the temperature rises to 60° C., the focal shift of the opticalimaging lens 11 is 0.0084 mm.

Reference is now made to FIGS. 50-53. FIG. 50 illustrates an examplecross-sectional view of an optical imaging lens 12 having six lenselements according to a twelfth example embodiment. FIG. 51 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 12 according to thetwelfth example embodiment. FIG. 52 shows an example table of opticaldata of each lens element of the optical imaging lens 12 according tothe twelfth example embodiment. FIG. 53 shows an example table ofaspherical data of the optical imaging lens 12 according to the twelfthexample embodiment.

As shown in FIG. 50, the optical imaging lens 12 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1 and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 12 mayinclude a thickness, aspherical data and/or an effective focal length ofeach lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 52 for the opticalcharacteristics of each lens element in the optical imaging lens 12 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 51(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.06 mm Referring to FIG. 51(b), the focus variation with respectto the three different wavelengths (470 nm, 555 nm and 650 nm) in thewhole field may fall within about ±0.05 mm Referring to FIG. 51(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm and 650 nm) in the whole field may fall within about ±0.05 mmReferring to FIG. 51(d), the variation of the distortion aberration ofthe optical imaging lens 12 may be within about ±60%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 12 may be shorter, and the field of view of theoptical imaging lens 12 may be larger as shown in FIG. 51 and FIG. 52.Moreover, the optical imaging lens 12 may be easier to be manufactured,such that yield thereof may be higher.

Please refer to FIG. 62B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62B, (V1+V5)/V2 in this embodiment may be designed tobe equal to 5.399, such that the optical imaging lens 12 in thisembodiment has better thermal stability. More specifically, the normaltemperature of 20° C. is set as a reference at which the focal shift ofthe optical imaging lens 12 is 0 mm. When the temperature is lowered to0° C., the focal shift of the optical imaging lens 12 is −0.0065 mm.When the temperature rises to 60° C., the focal shift of the opticalimaging lens 12 is 0.0047 mm.

Reference is now made to FIGS. 54-57. FIG. 54 illustrates an examplecross-sectional view of an optical imaging lens 13 having six lenselements according to a thirteenth example embodiment. FIG. 55 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 13 according to thethirteenth example embodiment. FIG. 56 shows an example table of opticaldata of each lens element of the optical imaging lens 13 according tothe thirteenth example embodiment. FIG. 53 shows an example table ofaspherical data of the optical imaging lens 13 according to thethirteenth example embodiment.

As shown in FIG. 54, the optical imaging lens 13 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1 and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 13 mayinclude a thickness, aspherical data and/or an effective focal length ofeach lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 56 for the opticalcharacteristics of each lens element in the optical imaging lens 13 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 55(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.045 mm Referring to FIG. 55(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm and 650 nm)in the whole field may fall within about ±0.06 mm Referring to FIG.55(c), the focus variation with respect to the three differentwavelengths (470 nm, 555 nm and 650 nm) in the whole field may fallwithin about ±0.06 mm Referring to FIG. 55(d), the variation of thedistortion aberration of the optical imaging lens 13 may be within about±60%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 13 may be shorter, and the field of view of theoptical imaging lens 13 may be larger as shown in FIG. 55 and FIG. 56.

Please refer to FIG. 62B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62B, (V1+V5)/V2 in this embodiment may be designed tobe equal to 5.399, such that the optical imaging lens 13 in thisembodiment has better thermal stability. More specifically, the normaltemperature of 20° C. is set as a reference at which the focal shift ofthe optical imaging lens 13 is 0 mm. When the temperature is lowered to0° C., the focal shift of the optical imaging lens 13 is −0.0105 mm.When the temperature rises to 60° C., the focal shift of the opticalimaging lens 13 is 0.0130 mm.

Reference is now made to FIGS. 58-61. FIG. 58 illustrates an examplecross-sectional view of an optical imaging lens 14 having six lenselements according to a fourteenth example embodiment. FIG. 59 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 14 according to thefourteenth example embodiment. FIG. 60 shows an example table of opticaldata of each lens element of the optical imaging lens 14 according tothe fourteenth example embodiment. FIG. 61 shows an example table ofaspherical data of the optical imaging lens 14 according to thefourteenth example embodiment.

As shown in FIG. 58, the optical imaging lens 14 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise a first lens element L1, a second lenselement L2, an aperture stop STO, a third lens element L3, a fourth lenselement L4, a fifth lens element L5 and a sixth lens element L6.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1 and L6A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, and L6A2 may begenerally similar to the optical imaging lens 1, but the differencesbetween the optical imaging lens 1 and the optical imaging lens 14 mayinclude a thickness, aspherical data and/or an effective focal length ofeach lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 60 for the opticalcharacteristics of each lens element in the optical imaging lens 14 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 59(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.05 mm Referring to FIG. 59(b), the focus variation with respectto the three different wavelengths (470 nm, 555 nm and 650 nm) in thewhole field may fall within about ±0.05 mm Referring to FIG. 59(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm and 650 nm) in the whole field may fall within about ±0.05 mmReferring to FIG. 59(d), the variation of the distortion aberration ofthe optical imaging lens 14 may be within about ±60%.

In comparison with the first embodiment, the effective focal length ofthe optical image lens 14 may be shorter, and the field of view of theoptical imaging lens 14 may be larger as shown in FIG. 59 and FIG. 60.Moreover, the optical imaging lens 14 may be easier to be manufactured,such that yield thereof may be higher.

Please refer to FIG. 62B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL, TL, EFL,(G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4), (T1+G12)/T6,(T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6), (V1+V5)N2,ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45), (T4+T5)/G12,(G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of the presentembodiment.

As shown in FIG. 62B, (V1+V5)N2 in this embodiment may be designed to beequal to 5.399, such that the optical imaging lens 14 in this embodimenthas better thermal stability. More specifically, the normal temperatureof 20° C. is set as a reference at which the focal shift of the opticalimaging lens 14 is 0 mm. When the temperature is lowered to 0° C., thefocal shift of the optical imaging lens 14 is −0.0078 mm. When thetemperature rises to 60° C., the focal shift of the optical imaging lens14 is 0.0080 mm.

Please refer to FIGS. 62A and 62B which show the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G6F, TTF, GFP, AAG, ALT, BFL, TTL,TL, EFL, (G12+G56)/(G23+T3+G34), AAG/(G45+G56), TL/(T2+T3+T4),(T1+G12)/T6, (T2+T5)/T3, ALT/(T2+G23), BFL/T1, TTL/(T5+G56+T6),(V1+V5)N2, ALT/(G12+G45), (T1+T2)/T3, (T1+T6)/T4, BFL/(G23+G34+G45),(T4+T5)/G12, (G56+T6)/T1, EFL/(T3+T4), T5/T2 and AAG/(T3+T6) of allembodiments, and it may be clear that the optical imaging lenses of anyone of the fourteen embodiments may satisfy the Equations (1), (1′) and(2)-(18).

The optical imaging lens in each embodiment of the present disclosurewith the arrangements of the convex or concave surface structuresdescribed below may advantageously increase the value of HFOV and thethermal stability with improved imaging quality: the first lens elementmay have negative refracting power. An optical axis region of theobject-side surface of the second lens element may be concave. Aperiphery region of the object-side surface of the fifth lens elementmay be convex. An optical axis region of the image-side surface of thesixth lens element may be concave. A periphery region of the image-sidesurface of the sixth lens element may be convex. The optical imaginglens may comprise no other lenses having refracting power beyond the sixlens elements. The optical imaging lens may satisfy Inequality (1):(G12+G56)/(G23+T3+G34)≥2.500. Alternatively, the first lens element mayhave negative refracting power. An optical axis region of theobject-side surface of the second lens element may be concave. Anoptical axis region of the object-side surface of the fourth lenselement may be convex. A periphery region of the object-side surface ofthe fifth lens element may be convex. An optical axis region of theimage-side surface of the sixth lens element may be concave. A peripheryregion of the image-side surface of the sixth lens element may beconvex. The optical imaging lens may comprise no other lenses havingrefracting power beyond the six lens elements. The optical imaging lensmay satisfy Inequality (1′): (G12+G56)/(G23+T3+G34)≥2.000.Alternatively, an optical axis region of the object-side surface of thesecond lens element may be concave. An optical axis region of theimage-side surface of the third lens element may be convex. An opticalaxis region of the object-side surface of the fourth lens element may beconvex. A periphery region of the image-side surface of the fourth lenselement may be concave. A periphery region of the object-side surface ofthe fifth lens element may be convex. An optical axis region of theimage-side surface of the sixth lens element may be concave. The opticalimaging lens may comprise no other lenses having refracting power beyondthe six lens elements. The optical imaging lens may satisfy Inequality(1′): (G12+G56)/(G23+T3+G34)≥2.000. The optical imaging lens withabovementioned configurations can effectively correct the sphericalaberration, the field curvature aberration and the distortionaberration.

The range of values within the maximum and minimum values derived fromthe combined ratios of the optical parameters can be implementedaccording to above mentioned embodiments.

According to above disclosure, the longitudinal spherical aberration,the field curvature aberration and the variation of the distortionaberration of each embodiment may meet the use requirements of variouselectronic products which implement an optical imaging lens. Moreover,the off-axis light with respect to 470 nm, 555 nm and 650 nm wavelengthsmay be focused around an image point, and the offset of the off-axislight for each curve relative to the image point may be controlled toeffectively inhibit the longitudinal spherical aberration, the fieldcurvature aberration and/or the variation of the distortion aberration.Further, as shown by the imaging quality data provided for eachembodiment, the distance between the 470 nm, 555 nm and 650 nmwavelengths may indicate that focusing ability and inhibiting abilityfor dispersion may be provided for different wavelengths.

In consideration of the non-predictability of the optical lens assembly,while the optical lens assembly may satisfy any one of inequalitiesdescribed above, the optical lens assembly herein according to thedisclosure may achieve a shortened length and smaller sphericalaberration, field curvature aberration, and/or distortion aberration,provide an enlarged field of view, increase an imaging quality and/orassembly yield, and/or effectively improve drawbacks of a typicaloptical lens assembly.

While various embodiments in accordance with the disclosed principlesare described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element sequentially froman object side to an image side along an optical axis, each of thefirst, second, third, fourth, fifth and sixth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through as well as an image-side surface facing toward theimage side and allowing the imaging rays to pass through, the opticalimaging lens comprising no other lens elements having refracting powerbeyond the first, second, third, fourth, fifth and sixth lens elementswherein: the first lens element has negative refracting power; anoptical axis region of the object-side surface of the second lenselement is concave; a periphery region of the object-side surface of thefifth lens element is convex; an optical axis region of the image-sidesurface of the sixth lens element is concave; a periphery region of theimage-side surface of the sixth lens element is convex; a distance fromthe image-side surface of the first lens element to the object-sidesurface of the second lens element along the optical axis is representedby G12; a distance from the image-side surface of the second lenselement to the object-side surface of the third lens element along theoptical axis is represented by G23; a distance from the image-sidesurface of the third lens element to the object-side surface of thefourth lens element along the optical axis is represented by G34; adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis isrepresented by G56; a thickness of the third lens element along theoptical axis is represented by T3; and the optical imaging lenssatisfies an inequality: (G12+G56)/(G23+T3+G34)≥2.500.
 2. The opticalimaging lens according to claim 1, wherein a sum of five air gaps fromthe first lens element to the sixth lens element along the optical axisis represented by AAG, a distance from the image-side surface of thefourth lens element to the object-side surface of the fifth lens elementalong the optical axis is represented by G45, and the optical imaginglens further satisfies an inequality: AAG/(G45+G56)≤2.900.
 3. Theoptical imaging lens according to claim 1, wherein a distance from theobject-side surface of the first lens element to the image-side surfaceof the sixth lens element along the optical axis is represented by TL, athickness of the second lens element along the optical axis isrepresented by T2, a thickness of the fourth lens element along theoptical axis is represented by T4, and the optical imaging lens furthersatisfies an inequality: TL/(T2+T3+T4)≥3.300.
 4. The optical imaginglens according to claim 1, wherein a thickness of the first lens elementalong the optical axis is represented by T1, a thickness of the sixthlens element along the optical axis is represented by T6, and theoptical imaging lens further satisfies an inequality: (T1+G12)/T6≥2.800.5. The optical imaging lens according to claim 1, wherein a thickness ofthe second lens element along the optical axis is represented by T2, athickness of the fifth lens element along the optical axis isrepresented by T5, and the optical imaging lens further satisfies aninequality: (T2+T5)/T3≥5.000.
 6. The optical imaging lens according toclaim 1, wherein a thickness of the second lens element along theoptical axis is represented by T2, a sum of the thicknesses of six lenselements from the first lens element to the sixth lens element along theoptical axis is represented by ALT, and the optical imaging lens furthersatisfies an inequality: ALT/(T2+G23)≤4.400.
 7. The optical imaging lensaccording to claim 1, wherein a distance from the image-side surface ofthe sixth lens element to an image plane along the optical axis isrepresented by BFL, a thickness of the first lens element along theoptical axis is represented by T1, and the optical imaging lens furthersatisfies an inequality: BFL/T1≤2.400.
 8. An optical imaging lenscomprising a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement sequentially from an object side to an image side along anoptical axis, each of the first, second, third, fourth, fifth and sixthlens elements having an object-side surface facing toward the objectside and allowing imaging rays to pass through as well as an image-sidesurface facing toward the image side and allowing the imaging rays topass through, the optical imaging lens comprising no other lens elementshaving refracting power beyond the first, second, third, fourth, fifthand sixth lens elements wherein: the first lens element has negativerefracting power; an optical axis region of the object-side surface ofthe second lens element is concave; an optical axis region of theobject-side surface of the fourth lens element is convex; a peripheryregion of the object-side surface of the fifth lens element is convex;an optical axis region of the image-side surface of the sixth lenselement is concave; a periphery region of the image-side surface of thesixth lens element is convex; a distance from the image-side surface ofthe first lens element to the object-side surface of the second lenselement along the optical axis is represented by G12; a distance fromthe image-side surface of the second lens element to the object-sidesurface of the third lens element along the optical axis is representedby G23; a distance from the image-side surface of the third lens elementto the object-side surface of the fourth lens element along the opticalaxis is represented by G34; a distance from the image-side surface ofthe fifth lens element to the object-side surface of the sixth lenselement along the optical axis is represented by G56; a thickness of thethird lens element along the optical axis is represented by T3; and theoptical imaging lens satisfies an inequality:(G12+G56)/(G23+T3+G34)≥2.000.
 9. The optical imaging lens according toclaim 8, wherein a distance from the object-side surface of the firstlens element to an image plane along the optical axis is represented byTTL, a thickness of the fifth lens element along the optical axis isrepresented by T5, a thickness of the sixth lens element along theoptical axis is represented by T6, and the optical imaging lens furthersatisfies an inequality: TTL/(T5+G56+T6)≤3.500.
 10. The optical imaginglens according to claim 8, wherein an Abbe number of the first lenselement is represented by V1, an Abbe number of the second lens elementis represented by V2, an Abbe number of the fifth lens element isrepresented by V5, and the optical imaging lens further satisfies aninequality: (V1+V5)V2≥4.400.
 11. The optical imaging lens according toclaim 8, wherein a sum of the thicknesses of six lens elements from thefirst lens element to the sixth lens element along the optical axis isrepresented by ALT, a distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis is represented by G45, and the optical imaging lensfurther satisfies an inequality: ALT/(G12+G45)≥4.600.
 12. The opticalimaging lens according to claim 8, wherein a thickness of the first lenselement along the optical axis is represented by T1, a thickness of thesecond lens element along the optical axis is represented by T2, and theoptical imaging lens further satisfies an inequality: (T1+T2)/T3≥3.400.13. The optical imaging lens according to claim 8, wherein a thicknessof the first lens element along the optical axis is represented by T1, athickness of the fourth lens element along the optical axis isrepresented by T4, a thickness of the sixth lens element along theoptical axis is represented by T6, and the optical imaging lens furthersatisfies an inequality: (T1+T6)/T4≥3.400.
 14. The optical imaging lensaccording to claim 8, wherein a distance from the image-side surface ofthe fourth lens element to the object-side surface of the fifth lenselement along the optical axis is represented by G45, a distance fromthe image-side surface of the sixth lens element to an image plane alongthe optical axis is represented by BFL, and the optical imaging lensfurther satisfies an inequality: BFL/(G23+G34+G45)≤3.100.
 15. An opticalimaging lens comprising a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element and asixth lens element sequentially from an object side to an image sidealong an optical axis, each of the first, second, third, fourth, fifthand sixth lens elements having an object-side surface facing toward theobject side and allowing imaging rays to pass through as well as animage-side surface facing toward the image side and allowing the imagingrays to pass through, the optical imaging lens comprising no other lenselements having refracting power beyond the first, second, third,fourth, fifth and sixth lens elements wherein: an optical axis region ofthe object-side surface of the second lens element is concave; anoptical axis region of the image-side surface of the third lens elementis convex; an optical axis region of the object-side surface of thefourth lens element is convex; a periphery region of the image-sidesurface of the fourth lens element is concave; a periphery region of theobject-side surface of the fifth lens element is convex; an optical axisregion of the image-side surface of the sixth lens element is concave; adistance from the image-side surface of the first lens element to theobject-side surface of the second lens element along the optical axis isrepresented by G12; a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis is represented by G23; a distance from the image-sidesurface of the third lens element to the object-side surface of thefourth lens element along the optical axis is represented by G34; adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis isrepresented by G56; a thickness of the third lens element along theoptical axis is represented by T3; and the optical imaging lenssatisfies an inequality: (G12+G56)/(G23+T3+G34)≥2.000.
 16. The opticalimaging lens according to claim 15, wherein a thickness of the fourthlens element along the optical axis is represented by T4, a thickness ofthe fifth lens element along the optical axis is represented by T5, andthe optical imaging lens further satisfies an inequality:(T4+T5)/G12≤2.200.
 17. The optical imaging lens according to claim 15,wherein a thickness of the first lens element along the optical axis isrepresented by T1, a thickness of the sixth lens element along theoptical axis is represented by T6, and the optical imaging lens furthersatisfies an inequality: (G56+T6)/T1≤3.100.
 18. The optical imaging lensaccording to claim 15, wherein an effective focal length of the opticalimaging lens is represented by EFL, a thickness of the fourth lenselement along the optical axis is represented by T4, and the opticalimaging lens further satisfies an inequality: EFL/(T3+T4)≥2.700.
 19. Theoptical imaging lens according to claim 15, wherein a thickness of thesecond lens element along the optical axis is represented by T2, athickness of the fifth lens element along the optical axis isrepresented by T5, and the optical imaging lens further satisfies aninequality: T5/T2≥1.000.
 20. The optical imaging lens according to claim15, wherein a thickness of the sixth lens element along the optical axisis represented by T6, a sum of five air gaps from the first lens elementto the sixth lens element along the optical axis is represented by AAG,and the optical imaging lens further satisfies an inequality:AAG/(T3+T6)≥2.500.